Excuse me, I answered your letter slowly because my English is not very good at, and when you call me. I'm so excited, because you're the first to call me. I thank you for selecting me for the interview.
Sorry that I answer your letter slow, because my English is not so good. And when you call me. I'm really excited because you were the first to call me. I thank you for choosing me for an interview.
I'm sorry I answer your letter late because my English isn't good. And when you call me. I was so excited, because you're the first telephone to me. I thank you that you choose me for the interview.